21998990538

Names of 21998990538

• Cardinal: 21998990538 can be written as Twenty-one billion, nine hundred ninety-eight million, nine hundred ninety thousand, five hundred thirty-eight.

Scientific notation

• Scientific notation: 2.1998990538 × 10¹⁰

Factors of 21998990538

• Number of distinct prime factors ω(n): 5
• Total number of prime factors Ω(n): 6
• Sum of prime factors: 222648

Divisors of 21998990538

• Number of divisors d(n): 48
• Complete list of divisors:
  1 2 3 6 7 9 14 18 21 42 63 126 787 1574 2361 4722 5509 7083 11018 14166 16527 33054 49581 99162 221849 443698 665547 1331094 1552943 1996641 3105886 3993282 4658829 9317658 13976487 27952974 174595163 349190326 523785489 1047570978 1222166141 1571356467 2444332282 3142712934 3666498423 7332996846 10999495269 21998990538
• Sum of all divisors σ(n): 54543153600
• Sum of proper divisors (its aliquot sum) s(n): 32544163062
• 21998990538 is an abundant number, because the sum of its proper divisors (32544163062) is greater than itself. Its abundance is 10545172524

Bases of 21998990538

• Binary: 10100011111001111011111010011001010₂
• Hexadecimal: 0x51F3DF4CA
• Base-36: A3TMPQI

Squares and roots of 21998990538

• 21998990538 squared (21998990538²) is 483955584691013529444
• 21998990538 cubed (21998990538³) is 10646534328429864287868540400872
• The square root of 21998990538 is 148320.5668071693
• The cube root of 21998990538 is 2801.9964731479

Scales and comparisons

• 21,998,990,538 seconds is equal to 699 years, 25 weeks, 6 days, 22 hours, 42 minutes, 18 seconds.
• To count from 1 to 21,998,990,538 would take you about one thousand, three hundred ninety-eight years!

  This is a very rough estimate, based on a speaking rate of half a second every third order of magnitude. If you speak quickly, you could probably say any randomly-chosen number between one and a thousand in around half a second. Very big numbers obviously take longer to say, so we add half a second for every extra x1000. (We do not count involuntary pauses, bathroom breaks or the necessity of sleep in our calculation!)

• A cube with a volume of 21998990538 cubic inches would be around 233.5 feet tall.

Recreational maths with 21998990538

• 21998990538 backwards is 83509989912
• 21998990538 is a Harshad number.
• The number of decimal digits it has is: 11
• The sum of 21998990538's digits is 63
• More coming soon!